# antivirus

/ˌæntiˈvaɪɹəs/ (US) · /ˌæntɪvˈaɪɹəs/ (UK) · CEFR B1 · Noun

Source: https://englishreference.com/word/antivirus
Updated: 2026-05-19

## Definition

a program or tool that helps protect your computer from viruses and other types of harmful software. You usually install it to keep your files safe.

For teachers: a software application designed to detect, prevent, and remove malicious software from a computer system. Often used as a shortened form of 'antivirus program'.

## Examples

- I need to install an antivirus to protect my laptop.
- The company provides a free antivirus to all employees to ensure their work computers remain secure from malware.
- Modern antivirus solutions often utilize heuristic analysis to identify previously unknown threats by examining the behavior of suspicious files rather than relying solely on a database of known signatures.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.